Linkage for fuel pumps



Dec. 10, 1929. F. N. NUTT LINKAGE FOR FUEL PUMPS Filed June 20. 1928 Patented Dec. 10, 1929 UNITED STATES PATENT OFFICE- rnanx n. norm, or rmnr, MICHIGAN, Assrsnon To A c sranx' PLUG comramr, or nmm,mrcn1ean, A. comranr or MICHIGAN LINKAGE FOR FUEL PUMPS Application filed June 20,

Although this invention is referred to as a fuel ump, it relates more particularly to a specific and quietly operating thrust-refusing connection between a reciprocated actuating element and a diaphragm stem or equivalentelementattachedto a pump diaphragm or other reciprocatorypumping element adapted to receiveavariable stroke,-said stroke being diminished in response to pressure within a pump chamber.

Although the principles of this invention are believed to be applicable to various types of fuel pumps, or the like, the illustrated pump is of the same general type as that de-. scribed and claimed in a pending application of Abraham M. Babitch, Serial 123,370, filed July 19, 1926; but the present invention may be regarded as relating particularly to the use of a flexible element comprising substantially inflexible open links, such as the links of an ordinary chain, terminal links being preferably of a special form hereinafter described, in connecting the mentioned actuating element with a diaphragm stem or other handling element attached to a reciprocatory pumping element.

Other ob'ects of this invention may be best appreciate from the following description of specific embodiments thereof, taken in con nection with the appended claims and the accompanying drawlngs.

Fig. 1 is, for the most part, a substantially median vertical section. v

Fig. 2 is a sectional detail view, taken as in dicated by the line 22 of Fig. 1.

Referrmg first to Fig. 1, 10 and 11 are respectively a body casting and a cover casting, a reciprocatory pumping element in the form of a diaphragm 12 being shown as secured therebetween, and as adapted to vary the volume of a pump chamber 13, provided with an inlet valve 14 and with an outlet valve 15. The diaphragm 12 is adapted to receive an intake stroke through an attached handling element in the form of a slidable rod or stem 16; an actuating element in the form of a lever 17 is shown as pivoted at 18 and as adapted to be continuously engaged by a reciprocatory or rotating driven element such as a cam 19 upon a shaft 20; and an inner end 21 of said lever.

1928. Serial No. 286,770. a

may be provided with means, such as a compression spring retained between cupped plates 22 and 23, tending constantly to press said lever against the cam 19, or its equivalent.

Coming now to the novel featuresor new combinations to whose protection the present apphcation is directed, an open link 24 is shown as secured to a reduced end 25 of the diaphragm stem 16 and to a reducedportionof the end 21 of lever 17 by means of U-sha ed open links 26, 26 and pivot pins 27, 27 shown as retained by cotters 28, 28'.

Using this construction, and assuming the link 24 to be substantially inelastic and Inextensible, and whether or not the respective links of a flexible connecting element of the described character remain always in mutual contact (the chain formed thereby merely sagglng between the pivot pins 27, 27 in a manner which substantially obviates contact noises during reciprocation of the lever 17 when the diaphragm 12. is held down b a pressure built up in the pump chamber 13 it will be seen that the intermediate means here described is incapable of transmitting a thrust from the lever 17, shown as having a uniform throw, to the diaphragm stem, or its equivalent; but it should be understood that, instead of a single complete elliptical link between U-shaped links, any desired plurality of intermediate links, either in parallel relationship or in series, may be inter osed in the general manner described; an that the lost motion provided by the indicated use of open links renders the length of stroke produced by a rocking of the lever 17,'or its equivalent, not only substantially noiseless but dependent upon the pressure built u within the pump chamber 13 by means suc as a compression s ring 29, serving to eflect the expulsion stro es of the diaphragm 12.

Although but a single form of this invention is herein shown, it will be obvious that numerous modifications thereof might easily be devised, all within the spirit and S00 e of this invention as the same 1s indicated a ove and in the following claims.

I claim: v

1. A pressure-responsive pump organization including: a reciprocable pump element 2 maa'reo having resilient means to efiect ex ulsion strokes thereof and also an attached andle element; an actuating element having a uniform throw; and a thrust-refusin motion- 5 transmitting means in the form 0 substantially inflexible open links adapted to so sag as substantially to obviate contact noises between said actuating element and said at-- tached element to impart variable strokes to thelatter.

2. A IeSSIlIQ-IIOSPODSIVB Ipump or amzation inc uding: a reciprocab e ump e ement having resilient means to e ect expulsion strokes thereof and also. an attached handle element, an actuating element havinga uniform throw; and a thrust-refusin motiontransmitting means in the form 0 substantially inflexible open links adapted to so sag as substantially to oviate contact noises between said actuating element and said attached element to impart variable strokes v to the latter, one terminal link being provided with means'for its pivotal 00111180171011 to said actuating element and said actuating means being provided with resilient means constantlX pressing the same against a cam.

3. pressure-responsive ump organization including: a reciprocab e ump element having resilient means to e ect expulsion strokes thereof and also an attached handle element; an actuating element having a uniform throw; and a flexible thrust-refusing motion-transmittin means in the form of substantially infiexfiile open links adapted to so sag as substantially to obviate contact noises between said actuating element and said attached element to impart variable strokes to the latter, both terminal links being provided with means for pivotal connectiOD.

In testimony whereof I aflix my si ature.

FRANK N. TT. 

